Occasionally seen in Hanoi are men and women riding bicycle with at least two big bee's nests into the city. These bee's nests are from the mountains and they sell them to people who want to soak them in rice wine. These bees and their nests are sold from 200,000Vnd for a kg and the average nest weighs two kilos.
Soaking one kg of bee's nest in five liters of rice wine and takes at least 5 months to infuse. People say that this bee wine is very healthy, it helps clean your blood, reinforce your immunity and fix your physical problems, but I don't really think so. You can try some at any Vietnamese wine shop.